Okla. Stat. tit. 19, § 19-863.18: Permits - Enforcement of regulations

After the adoption of such zoning regulations or building line

regulations by the board and/or the council, no building or other

structures shall be erected, constructed, enlarged or altered, or

repaired in such manner as to prolong the life of the building, nor

shall the use of any land be changed without a permit issued by the

county inspector as to territory falling within the jurisdiction of

the county and of the building inspector of the municipality as to

territory falling within the jurisdiction of the municipality. The

county inspector shall have the duty of administering the rules and

regulations under this act applicable to the unincorporated area of

the county, and shall make such inspections and investigations as

may be necessary to the proper enforcement of such rules and

regulations. The building inspector and the engineer of the

municipality shall have the duty of administering the rules and

regulations under this act applicable to the jurisdiction of the

municipality and shall make such inspections and investigations as

may be necessary to the proper enforcement of such rules and

regulations, except that in the matter of construction, surfacing

and maintenance of streets, roads, and highways in the entire

unincorporated area of the county, the board may prescribe rules and

regulations and prescribe standards and the county engineer shall

have the duty of administering such rules and regulations and shall

make such inspections and investigations as may be necessary to the

proper enforcement of such rules and regulations.